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s=6cm
v=1/3 la t
60=1/3 36 t
t=5
4. v=1/3 la t
162=1/3.81.t
t=6
la=81
s=9
luas seluruh sisi tegak= 4.lsegitiga
=4. (1/2 6 .)
= 4. 3.
=12